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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // This files contains runtime support implemented in JavaScript. | 5 // This files contains runtime support implemented in JavaScript. |
6 | 6 |
7 // CAUTION: Some of the functions specified in this file are called | 7 // CAUTION: Some of the functions specified in this file are called |
8 // directly from compiled code. These are the functions with names in | 8 // directly from compiled code. These are the functions with names in |
9 // ALL CAPS. The compiled code passes the first argument in 'this' and | 9 // ALL CAPS. The compiled code passes the first argument in 'this' and |
10 // it does not push the function onto the stack. This means that you | 10 // it does not push the function onto the stack. This means that you |
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29 // ECMA-262 Section 11.9.3. | 29 // ECMA-262 Section 11.9.3. |
30 function EQUALS(y) { | 30 function EQUALS(y) { |
31 if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y); | 31 if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y); |
32 var x = this; | 32 var x = this; |
33 | 33 |
34 while (true) { | 34 while (true) { |
35 if (IS_NUMBER(x)) { | 35 if (IS_NUMBER(x)) { |
36 while (true) { | 36 while (true) { |
37 if (IS_NUMBER(y)) return %NumberEquals(x, y); | 37 if (IS_NUMBER(y)) return %NumberEquals(x, y); |
38 if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal | 38 if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal |
| 39 if (IS_SYMBOL(y)) return 1; // not equal |
39 if (!IS_SPEC_OBJECT(y)) { | 40 if (!IS_SPEC_OBJECT(y)) { |
40 // String or boolean. | 41 // String or boolean. |
41 return %NumberEquals(x, %ToNumber(y)); | 42 return %NumberEquals(x, %ToNumber(y)); |
42 } | 43 } |
43 y = %ToPrimitive(y, NO_HINT); | 44 y = %ToPrimitive(y, NO_HINT); |
44 } | 45 } |
45 } else if (IS_STRING(x)) { | 46 } else if (IS_STRING(x)) { |
46 while (true) { | 47 while (true) { |
47 if (IS_STRING(y)) return %StringEquals(x, y); | 48 if (IS_STRING(y)) return %StringEquals(x, y); |
48 if (IS_SYMBOL(y)) return 1; // not equal | 49 if (IS_SYMBOL(y)) return 1; // not equal |
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494 | 495 |
495 // ECMA-262, section 9.3, page 31. | 496 // ECMA-262, section 9.3, page 31. |
496 function ToNumber(x) { | 497 function ToNumber(x) { |
497 if (IS_NUMBER(x)) return x; | 498 if (IS_NUMBER(x)) return x; |
498 if (IS_STRING(x)) { | 499 if (IS_STRING(x)) { |
499 return %_HasCachedArrayIndex(x) ? %_GetCachedArrayIndex(x) | 500 return %_HasCachedArrayIndex(x) ? %_GetCachedArrayIndex(x) |
500 : %StringToNumber(x); | 501 : %StringToNumber(x); |
501 } | 502 } |
502 if (IS_BOOLEAN(x)) return x ? 1 : 0; | 503 if (IS_BOOLEAN(x)) return x ? 1 : 0; |
503 if (IS_UNDEFINED(x)) return NAN; | 504 if (IS_UNDEFINED(x)) return NAN; |
504 if (IS_SYMBOL(x)) return NAN; | 505 if (IS_SYMBOL(x)) throw MakeTypeError('symbol_to_number', []); |
505 return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x)); | 506 return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x)); |
506 } | 507 } |
507 | 508 |
508 function NonNumberToNumber(x) { | 509 function NonNumberToNumber(x) { |
509 if (IS_STRING(x)) { | 510 if (IS_STRING(x)) { |
510 return %_HasCachedArrayIndex(x) ? %_GetCachedArrayIndex(x) | 511 return %_HasCachedArrayIndex(x) ? %_GetCachedArrayIndex(x) |
511 : %StringToNumber(x); | 512 : %StringToNumber(x); |
512 } | 513 } |
513 if (IS_BOOLEAN(x)) return x ? 1 : 0; | 514 if (IS_BOOLEAN(x)) return x ? 1 : 0; |
514 if (IS_UNDEFINED(x)) return NAN; | 515 if (IS_UNDEFINED(x)) return NAN; |
515 if (IS_SYMBOL(x)) return NAN; | 516 if (IS_SYMBOL(x)) throw MakeTypeError('symbol_to_number', []); |
516 return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x)); | 517 return (IS_NULL(x)) ? 0 : ToNumber(%DefaultNumber(x)); |
517 } | 518 } |
518 | 519 |
519 | 520 |
520 // ECMA-262, section 9.8, page 35. | 521 // ECMA-262, section 9.8, page 35. |
521 function ToString(x) { | 522 function ToString(x) { |
522 if (IS_STRING(x)) return x; | 523 if (IS_STRING(x)) return x; |
523 if (IS_NUMBER(x)) return %_NumberToString(x); | 524 if (IS_NUMBER(x)) return %_NumberToString(x); |
524 if (IS_BOOLEAN(x)) return x ? 'true' : 'false'; | 525 if (IS_BOOLEAN(x)) return x ? 'true' : 'false'; |
525 if (IS_UNDEFINED(x)) return 'undefined'; | 526 if (IS_UNDEFINED(x)) return 'undefined'; |
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647 return i; | 648 return i; |
648 } | 649 } |
649 | 650 |
650 | 651 |
651 // NOTE: Setting the prototype for Array must take place as early as | 652 // NOTE: Setting the prototype for Array must take place as early as |
652 // possible due to code generation for array literals. When | 653 // possible due to code generation for array literals. When |
653 // generating code for a array literal a boilerplate array is created | 654 // generating code for a array literal a boilerplate array is created |
654 // that is cloned when running the code. It is essential that the | 655 // that is cloned when running the code. It is essential that the |
655 // boilerplate gets the right prototype. | 656 // boilerplate gets the right prototype. |
656 %FunctionSetPrototype($Array, new $Array(0)); | 657 %FunctionSetPrototype($Array, new $Array(0)); |
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